linux-kernel - Re: [PATCH v2 1/4] meminfo: add a per node counter for balloon drivers

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Message-ID: <a0315ccf-f244-460e-8643-fd7388724fe5@redhat.com>
Date: Mon, 17 Mar 2025 16:37:43 -0600
From: Nico Pache <npache@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
 xen-devel@...ts.xenproject.org, linux-fsdevel@...r.kernel.org,
 linux-mm@...ck.org, virtualization@...ts.linux.dev,
 alexander.atanasov@...tuozzo.com, muchun.song@...ux.dev,
 roman.gushchin@...ux.dev, mhocko@...nel.org, kys@...rosoft.com,
 haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
 jgross@...e.com, sstabellini@...nel.org, oleksandr_tyshchenko@...m.com,
 mst@...hat.com, david@...hat.com, yosry.ahmed@...ux.dev, hannes@...xchg.org,
 nphamcs@...il.com, chengming.zhou@...ux.dev, kanchana.p.sridhar@...el.com,
 llong@...hat.com, shakeel.butt@...ux.dev
Subject: Re: [PATCH v2 1/4] meminfo: add a per node counter for balloon
 drivers



On 3/14/25 7:06 PM, Andrew Morton wrote:
> On Fri, 14 Mar 2025 15:37:54 -0600 Nico Pache <npache@...hat.com> wrote:
> 
>> Add NR_BALLOON_PAGES counter to track memory used by balloon drivers and
>> expose it through /proc/meminfo and other memory reporting interfaces.
>>
>> ...
>>
>> --- a/fs/proc/meminfo.c
>> +++ b/fs/proc/meminfo.c
>> @@ -162,6 +162,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
>>  	show_val_kb(m, "Unaccepted:     ",
>>  		    global_zone_page_state(NR_UNACCEPTED));
>>  #endif
>> +	show_val_kb(m, "Balloon:        ",
>> +		    global_node_page_state(NR_BALLOON_PAGES));
> 
> Please update Documentation/filesystems/proc.rst for this.

@Andrew

Can you please squash the following?

>From b1b379a32752e64c60b5e3b6365c93db8e1daf9f Mon Sep 17 00:00:00 2001
From: Nico Pache <npache@...hat.com>
Date: Mon, 17 Mar 2025 16:07:18 -0600
Subject: [PATCH] Documentation: document Balloon Meminfo entry

Add a Balloon entry to the Meminfo documention.

Signed-off-by: Nico Pache <npache@...hat.com>
---
 Documentation/filesystems/proc.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 09f0aed5a08b..2868bb74f76e 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -1060,6 +1060,7 @@ Example output. You may not have all of these fields.
     FilePmdMapped:         0 kB
     CmaTotal:              0 kB
     CmaFree:               0 kB
+    Balloon:               0 kB
     HugePages_Total:       0
     HugePages_Free:        0
     HugePages_Rsvd:        0
@@ -1228,6 +1229,8 @@ CmaTotal
               Memory reserved for the Contiguous Memory Allocator (CMA)
 CmaFree
               Free remaining memory in the CMA reserves
+Balloon
+              Memory returned to Host by VM Balloon Drivers
 HugePages_Total, HugePages_Free, HugePages_Rsvd, HugePages_Surp, Hugepagesize,
Hugetlb
               See Documentation/admin-guide/mm/hugetlbpage.rst.
 DirectMap4k, DirectMap2M, DirectMap1G
-- 
2.48.1
>